Cuts into my solar power generation through. So its a trade-off. Interestingly enough, from an energy production perspective the solar panels on the roof result in more reduction in CO2 than the trees do.
Some of the trees also attract rats, which drives my dogs nuts at night and is then a source of anxiety given the high crime rate in our country. Trees along the perimeter of the property have damaged the boundary walls, and other trees have ruined sewerage lines. If you want to plant trees, make sure you understand the potential future costs associated with them.
Seriously, I don't get the weird obsession with rooftop PV as if it's the only way to be green. PV is great, but, it doesn't work for every house. Personally, I have big oaks out front helping block passive solar windows in the summer, and the peak of my roof runs north-south so cell mounting would be tricky. That doesn't mean I can't get clean energy, it just means I buy it from a utility company, who are buying it from my neighbor's house where the orientation and canopy placement makes sense to do PV.
The backside of solar panels are actually quite pretty, and provide shade + partial rain barriers.
This would open up more avenues to passive cooling and also reduce the lock-step replacement of the house’s roof with solar panel installation .
Regardless of the environmental angle, having trees near your house is not worth it financially.
Most people I know go to great lengths to remove trees near their house. Some insurance companies lower premiums for it.
For any elevated property it adds a huge amount of value to kill a nice old established tree in the way of views.
A shade tree can reduce your need for electricity, but it can’t turn you into a net producer.
I’m making the explicit assumption that a shade tree will probably be fully grown.
And if you burn that wood, it's all released back into the air. Even if it just dies and decays, some of it ends up being released.
We already have amazing reserves of CO2, and we're digging them up and releasing them by burning them! Trees are just a tiny band-aid on top of this massive harm we're self-inflicting.
According to many sources, but I will cite this one[1] a single tree converts about 50 lbs of CO2 in a year. There are three trees on my property, a city tree (planted by the city) and two Birch trees planed by the original developer. All are deciduous so lose leaves in the winter but we'll give them full credit anyway, so call it 150 lbs of CO2 a year.
My rooftop solar system nominally puts out 5.2 kW of power under full sunlight, although efficiencies cut that down to around 4.8 kW net into the grid. I have over 10 years of data from the system, drilled down though it averages out to about 4.5 "solar hours" per day with an average daily output of about 22 kWH per day or about 8 MWH per year.
The US Energy Information Association (EIA) tracks a number of statistics, but the one that is most relevant is the number of metric tons of CO2 per MWH per state. You can see California's number in this report : https://www.eia.gov/electricity/state/california/ is 474 lbs per MWH.
Using that number, my rooftop solar system "saves" (which is to say doesn't generate) about 3,792 lbs of CO2 a year. Which, is way more than the 150 lbs a year the trees are taking out of the air. This is why the 1.2T trees, or 160 per person, is such a large number. A family of four would need to plan 640 trees on their lot, which would remove 32,000 lbs of CO2, which is a lot. To match my solar panels I would need to plant an additional 76 trees.
What you can take away from that is that solar panels in places where you can't put trees are a solid alternative. And planting trees rather than letting unused land sit idle as a field of grass is also a good plan. As a home owner, solar, even in places where it won't generate all your energy needs, will help cut CO2 emissions.
[1] https://projects.ncsu.edu/project/treesofstrength/treefact.h...
An average U.S. household uses 830 kilowatt-hours of electricity per month. On average,producing 1000 kWh of electricity with solar power reduces emissions by nearly 8 pounds ofsulfur dioxide, 5 pounds of nitrogen oxides, and more than 1,400 pounds of carbon dioxide.During its projected 28 years of clean energy production, a rooftop system with 2-year paybackand meeting half of a household’s electricity use would avoid conventional electrical plantemissions of more than half a ton of sulfur dioxide, one-third a ton of nitrogen oxides, and 100tons of carbon dioxide. PV is clearly a wise energy investment with great environmental benefits! -- https://www.nrel.gov/docs/fy99osti/24619.pdf
Of course, this reasoning is limited to carbon effects only. There are other important ecological concerns that trees might address that solar would not.
...an individual leaf might be peak out at 3% efficient, but it is operating just a portion of the year (maybe about a third to a half at full performance) and also much light gets reflected, absorbed by branches, or misses the leaves entirely.
Additionally, photovoltaics peak at 40% efficiency but get about 15-20% efficiency typically and can function the entire year (unless fully covered by snow). And they're displacing electricity produced primarily from fossil fuels which are burned at 30-40% efficiency.
Now from a top-down perspective: forests (in this case calculated by replacing cropland with forests) are estimated to sequester about 2 to 10 tons of CO2 per acre per year. https://fas.org/sgp/crs/misc/R40562.pdf
In principle, an acre of about 40% solar photovoltaic system with a 25% capacity factor could produce about 3.5GWh per year. But typically, about exactly one tenth that is done in practice: 0.35GWh/year/acre.
Since you'd be displacing electricity from the US grid, which is currently about 420 grams of CO2 per kWh (based on my calculations of the most recent eia.gov figures, but you can find similar figures by Googling), that's equivalent to 147 metric tons of CO2 per acre per year for typical photovoltaics (and over 1000 metric tons per acre per year in the idealized case).
This person's calculations reach similar conclusions: https://www.solarpowerrocks.com/environment/installing-solar...
So absolutely, it's better to use solar panels than trees, at least until the grid is fully or nearly-fully saturated by solar.
...BUT once we fully clean the grid, trees have some advantages: 1) they efficiently suck CO2 out of the air and store it, not just produce the energy. That means you can actually draw-down CO2, producing negative emissions. 2) They're scalable. A tree is like a solar farm, CO2 direct air absorption system, and a chemical factory but can be planted as just a seed. It may not be "efficient", but being self-replicating and scalable is pretty powerful.